Women who plan on becoming pregnant are told they need enough of the nutrient folate to ensure proper neurodevelopment of their babies, but new research from the Johns Hopkins Bloomberg School of Public Health suggests there could be serious risks in having far too much of the same nutrient.

The researchers found that if a new mother has a very high level of folate right after giving birth – more than four times what is considered adequate – the risk that her child will develop an autism spectrum disorder doubles. Very high vitamin B12 levels in new moms are also potentially harmful, tripling the risk that her offspring will develop an autism spectrum disorder. If both levels are extremely high, the risk that a child develops the disorder increases 17.6 times. Folate, a B vitamin, is found naturally in fruits and vegetables, while the synthetic version, folic acid, is used to fortify cereals and breads in the United States and in vitamin supplements.

The findings will be presented May 13 at the 2016 International Meeting for Autism Research in Baltimore. A press conference is scheduled for 10 a.m. on May 11 at the at the Baltimore Convention Center, Room 302-303.

“Adequate supplementation is protective: That’s still the story with folic acid,” says one of the study’s senior authors M. Daniele Fallin, PhD, director of the Bloomberg School’s Wendy Klag Center for Autism and Developmental Disabilities. “We have long known that a folate deficiency in pregnant mothers is detrimental to her child’s development. But what this tells us is that excessive amounts may also cause harm. We must aim for optimal levels of this important nutrient.”

Folate is essential in cell growth and promotes neurodevelopmental growth. Deficiencies early in pregnancy have been linked to birth defects and to an increased risk of developing an autism spectrum disorder. And despite this push to ensure women get adequate folate, some women still don’t get enough or their bodies aren’t properly absorbing it, leading to deficiencies. The Centers for Disease Control and Prevention says that one in four women of reproductive age in the U.S. have insufficient folate levels. Levels are not routinely monitored during pregnancy.

Autism spectrum disorder is a neurodevelopmental condition characterized by social impairment, abnormal communication and repetitive or unusual behavior. One in 68 children in the U.S. have the disorder, with boys five times more likely than girls to have it. The causes remain unclear but research suggests the factors are a combination of genes and the environment.

For the study, researchers analyzed data from 1,391 mother-child pairs in the Boston Birth Cohort, a predominantly low-income minority population.

The mothers were recruited at the time of their child’s birth between 1998 and 2013 and followed for several years, with the mother’s blood folate levels checked once within the first one to three days of delivery. The researchers found that one in 10 of the women had what is considered an excess amount of folate (more than 59 nanomoles per liter) and six percent had an excess amount of vitamin B12 (more than 600 picomoles per liter).

The World Health Organization says that between 13.5 and 45.3 nanomoles per liter is an adequate amount of folate for a woman in her first trimester of pregnancy. Unlike with folate, there are not well-established thresholds for adequate vitamin B12 levels.

A large majority of the mothers in the study reported having taken multivitamins – which would include folic acid and vitamin B12 – throughout pregnancy. But the researchers say they don’t know exactly why some of the women had such high levels in their blood. It could be that they consumed too many folic acid-fortified foods or took too many supplements. Or, they say, it could be that some women are genetically predisposed to absorbing greater quantities of folate or metabolizing it slower, leading to the excess. Or it could be a combination of the two.

More research is needed, the scientists say, in order to determine just how much folic acid a woman should consume during pregnancy to have the best chance that she will have optimal blood folate levels to ensure her offspring’s health.

With many types of vitamin supplements, the conventional wisdom has been that too much is not harmful, that the body will flush out the excess. That may not be the case with folic acid and vitamin B12.

“This research suggests that this could be the case of too much of a good thing,” says study lead author Ramkripa Raghavan, MPH, MSc, a DrPH candidate in the Department of Population, Family and Reproductive Health at the Bloomberg School. “We tell women to be sure to get folate early in pregnancy. What we need to figure out now is whether there should be additional recommendations about just what an optimal dose is throughout pregnancy.”

In summary: FFS

In more detail:

If the study had shown a causal link between excess ingestion of folate and B12, this would be an extraordinary finding. It would therefore require extraordinary evidence.

However, this study only shows an association, which may be due to chance, reverse causation, or a common unknown factor causing both an increase in ASD diagnosis, and B12/ folate levels.

The study might appear to be large and well-powered, and it is hard to comment without the data, but I would estimate that you are talking about the difference between (roughly) 104 out of 1250 ‘low folate’ women having children with ASD, versus 3 out of 140 women with ‘high’ folate, when one would expect 1 diagnosis in for this number. So you are essentially talking about 2 extra diagnoses, which in a complex spectrum condition like ASD is impossible to interpret as anything other than chance. The figure of 17.6 for having both high folate and B12 is literally meaningless.

So even on the basis of their data, which has not been peer-reviewed, the authors are going way out on a limb in drawing casual connections here, and are being quite irresponsible in undermining decades of public health work to increase the numbers of women taking folate before and during pregnancy, in order to prevent potentially devastating neurological conditions.